Origin Attribute (Type 1); Origin Attribute Configuration Example - Static Route Distribution; Figure 10: Bgp Origin Attribute Configuration Example - Avaya 8000 Technical Configuration Manual

14.1 Origin Attribute (Type 1)

The Origin attribute is a well-known mandatory attribute that specifies the source of a route. The Origin is
created by the AS that originates the route and includes the following possible values:

IGP – The route is interior to the originating AS that inserts this route into the BGP table (0 =
IGP).

EGP – The route is learned via the Exterior Gateway Protocol (EGP) prior to being inserted into
the BGP table (1 = BGP).

Incomplete (INC) – The origin of the route is unknown or learned by some other means. For
example, these routes could be learned through RIP, OSPF, or static routes (2 = INComplete)
BGP uses the Origin attribute in its decision making process. BGP prefers the path with the lowest origin
type. IGP is the lowest Origin type followed by EGP and Incomplete.
14.1.1 Origin Attribute Configuration Example – Static Route
Distribution
In this example, we will configure 9001 to distribute static routes for network 44.44.44.0/24. ERS8000-D
route table should display this static route as INC (incomplete) and all other routes as IGP.

Figure 10: BGP Origin Attribute Configuration Example

January 2016
Avaya Inc. – External Distribution
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